Benchmark of GW Methods for Core-Level Binding Energies

Jiachen Li, Ye Jin, Patrick Rinke, Weitao Yang, Dorothea Golze*

*Corresponding author for this work

Research output: Contribution to journalArticleScientificpeer-review

26 Citations (Scopus)
70 Downloads (Pure)

Abstract

The GW approximation has recently gained increasing attention as a viable method for the computation of deep core-level binding energies as measured by X-ray photoelectron spectroscopy. We present a comprehensive benchmark study of different GW methodologies (starting point optimized, partial and full eigenvalue-self-consistent, Hedin shift, and renormalized singles) for molecular inner-shell excitations. We demonstrate that all methods yield a unique solution and apply them to the CORE65 benchmark set and ethyl trifluoroacetate. Three GW schemes clearly outperform the other methods for absolute core-level energies with a mean absolute error of 0.3 eV with respect to experiment. These are partial eigenvalue self-consistency, in which the eigenvalues are only updated in the Green's function, single-shot GW calculations based on an optimized hybrid functional starting point, and a Hedin shift in the Green's function. While all methods reproduce the experimental relative binding energies well, the eigenvalue self-consistent schemes and the Hedin shift yield with mean absolute errors <0.2 eV the best results.

Original languageEnglish
Pages (from-to)7570-7585
Number of pages16
JournalJournal of Chemical Theory and Computation
Volume18
Issue number12
Early online date2 Nov 2022
DOIs
Publication statusPublished - 13 Dec 2022
MoE publication typeA1 Journal article-refereed

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